YES
Time: 0.015

Problem:
 Equations:
  
 TRS:
  fAC(g(fAC(h(x),x)),x) -> fAC(h(x),fAC(x,x))
  fAC(h(x),g(x)) -> fAC(g(h(x)),x)
  fAC(g(h(x)),fAC(x,fAC(x,y))) -> fAC(g(fAC(h(x),y)),x)
  fAC(g(g(x)),x) -> fAC(g(x),g(x))

Proof:
 AC-KBO Processor:
  precedence:
   h > fAC > g
   weight function:
    w0 = 5
    w(g) = 15
    w(h) = 9
    w(fAC) = 0
   problem:
    Equations:
     
    TRS:
     
   Qed